NEC Corporation (TSE: 6701) has announced successful transmission tests that took place over a commercial subsea cable measuring more than 10,000 kilometers using artificial intelligence (AI) and probabilistic shaping at a modulation of 64QAM.

NEC, in a joint research publication with Google, has demonstrated for the first time that the FASTER open subsea cable can be upgraded to a spectral efficiency of 6 bits per second per hertz (b/s/Hz) in an 11,000km segment. This represents a capacity of more than 26 terabits per second (Tb/s) in the C-band, which is over 2 1/2 times the capacity originally planned for the cable, for no additional wet plant capital expenditure. In doing so, the authors set a spectral efficiency-distance product record of 66,102 b/s/Hz in a field trial performed together with live traffic neighboring channels.

The team achieved this result using near-Shannon probabilistic-shaping at a modulation of 64QAM, and for the first time on a live cable, artificial intelligence (AI) was used to analyze data for the purpose of nonlinearity compensation (NLC). NEC developed an NLC algorithm based on data-driven deep neural networks (DNN) to accurately and efficiently estimate the signal nonlinearity.

"Other approaches to NLC have attempted to solve the nonlinear Schrodinger equation, which requires the use of very complex algorithms," said NEC's Mr. Toru Kawauchi, General Manager, Submarine Network Division. "This approach sets aside those deterministic models of nonlinear propagation, in favor of a low-complexity black-box model of the fiber, generated by machine learning algorithms. The results demonstrate both an improvement in transmission performance and a reduction in implementation complexity. Furthermore, since the black-box model is built up from live transmission data, it does not require advance knowledge of the cable parameters. This allows the model to be used on any cable without prior modeling or characterization, which shows the potential application of AI technology to open subsea cable systems, on which terminal equipment from multiple vendors may be readily installed."

These field trial results were recently presented at the post-deadline session of the Optical Fiber Communication Conference and Exhibition (OFC) 2018 in San Diego, California. The experimental demonstration of NLC achieved a generalized mutual-information (GMI) capacity gain of -0.15 b/s/2-pol, which is equivalent to a capacity increase of 15 gigabits per second (Gb/s) in every 100GHz of fiber bandwidth. NEC announced plans to continue this AI-based research, with the dual aims of increasing system capacity while reducing the complexity of implementation. For more details about the paper, you may download the paper here.

NEC has more than 40 years of experience in the submarine cable business and is recognized as one of the world's top submarine system vendors. NEC has laid a total of more than 250,000 kilometers of submarine cable, the equivalent of six trips around the earth. As a total system integrator, NEC produces optical submarine cable, optical submarine repeaters and equipment for connecting optical transmissions to land, in addition to carrying out ocean surveys, route design, laying optical submarine cable and training personnel for the handover of these systems.